sort.py

def sorting_nums(item):
	item = sorted(item)
	len_item = len(item)
	middle = len_item // 2
	new_item = []
	for i in range(middle):
		new_item.append(item[i])
		new_item.append(item[-1-i])

	if len_item % 2 == 1:
		new_item.append(item[middle])
		
	return new_item



a = [1,5,4,6,7,2,3]
print(sorting_nums(a))